Locking attachment for the let-off mechanism of looms



(Model.)

T. PLATT.

LOOKING ATTACHMENT FOR THE LET-OPP MECHANISM OF LOOMS.

No. 273.889. Patented Mar.13,1883.

WITNESS/5S Mr, Washington, D. c.

NiTEn STATES PATENT EETcE.

THOMAS PLATT, OF CHESTER, PENNSYLVANIA.

LOCKING ATTACHMENT FOR THE LET-OFF MECHANISM OF LOOMS.

SPECIFICATION forming part of Letters Patent No. 273,889, dated March13, 1883.

Application filed April 4, 1882. (Model) To all whom it may concern:

Be it known that I, THOMAS PLATT, a citizen of the United States ofAmerica, residing at Chester, in the county of Delaware and State ofPennsylvania, have invented certain new and usefulImprovements inLocking AttachmentsfortheLet-Ott'MechanisinofLooms; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to locking attachments for the let-off mechanismof looms; and it has for its object to prevent the weaver or workers ofthe looms from tampering with the warp-beam or the devices for creatingfriction on the warp-beam.

It is the custom in many establishments to pay the weavers by thepiece-that is to say, so much a yard for weaving; hence an irregularpractice is followed by the weavers of setting the let-oii mechanism sothat the warp will run too freely and work off more goodsin length thanthey would otherwise. When operated in this manner the looms producegoods of an inferior quality or less in thickness than desired.

The object of my improvement is to prevent this objectionable practiceby simple and cheap means.

My invention consists in the novel construction of a bracket adapted topartially surround a brake-lever and to conceal the nut of the bolt towhich the friction-band is attached.

My invention further consists in the novel construction and combinationof parts, as will be hereinafter more fully set forth.

In the annexed drawings, Figure 1 represents an end view ot'a loom,showing the letofi mechanism with my improvements applied thereto. Fig.2 is a detail view, partly in section, showing the attachment connectedto the brake-lever and lower end of a friction-band. Figs. 3 and 4 areperspective views of the bracket or guard and staple, and Fig. 5 is asectional view of the bracket for holding down the brake-lever.

The letters A and A represent the opposite side frames of the loom, andthe letter B represents the warp-beani, thejournals of which revolve inslotted bearings in the said frames. The warp-beam has at each end agrooved head or pulley, O, for the reception of the usual band, 0, bywhich more orless retarding friction is exerted upon the warp-beam. Tothe lower end of these bands 0 are connected the eyebolts D, which passthrough the warp-beam levers D substantially as indicated in Figs. 1 and2 of the drawings.

The letter E (see Fig. 3) represents the bracket or guard, madepreferably of cast or malleable iron. This bracket or guard consists ofavertical wall, a, a bottom wall, I),

formed with an opening, 0, for the passage of a bolt, D, and side walls,(I, forming a cavity or recess for the reception of the nut D, that isplaced upon the eyebolt, and this bracket, near its upper end, is formedwith a shoulder, 6, adapted to fit slightly over the upper surface ofthe brake-lever D and with a backward extension, f, formed with avertical elongated slot, h. The letter F (see Fig. 4) represents aT-shaped staple formed at one end with a perforation or aperture, k.These partsto 'wit, the bracket and the staple-are applied to theeyebolt and brake-lever D substantiallyin the manner indicated in Figs.1 and 2 of the drawings-that is, the bracket or guard is adjusted to thebrake-lever D so that the recessed portion of the bracket will pass overthe end of the bolt D and inclose the nut, so that the weaver cannottake it o'lf or alter the same, and so as to protect the nut of theeyebolt from being adjusted or altered by the weaver. Through the eye ofthe eyebolt the T-shaped staple F is then inserted, with the perforatedportion extending through theslot of the bracket, so that the eye of thestaple will project beyond the outer surface of the bracket to receive awasher, F, and the staple of a lock or other looking or sealing means,F, as indicated in Fig. 2 ot' the drawings. The office of the shoulder ein the bracket or guard E isto tit over the upper surface of thebrakelever D and prevent the said lever from leaving its seat or beingraised.

With these attachments applied it will be observed that it will beimpossible for unauthorized personsthe weavers-to adjust or alter thelet-oft mechanism of the warp without breaking or destroying the lookingor sealing means, and that as long as the means are preserved locked orsealed a change of adj ustment will be impossible and a perfectuniformity in the cloth is insured on each loom.

Fig. 5 of the drawings shows in sectional detail a bracket consisting ofthe Vertical wall 1, formed with two or more holes, 2, or an elongatedslot, the top horizontal wall, 3, and downward extension 4. One of thesebrackets is bolted on each side of the frame, substantially as seen inFig. lot the drawings, so that the upper end ofeach bracket will fitover the brake-lever and hold the same in a depressed position, therebydoing away with the ordinary weights.

What I claim as my invention, and desire to secure by Letters Patent,is-

atlases slot h, perforation 0, and surrounding recess,

the T-shaped staple F, formed with perforation 1:, and a locking device,substantially as described.

In testimony whereofI affix my signature in presence of two witnesses.

THOMAS PLATT.

Witnesses:

WILLIAM EVANS, DAVID EVANS.

